Initial Installation Unit Number Assignment; Stack Mac Address - Nortel 4500 Series Installation Manual

46 Installing the Nortel Ethernet Routing Switch
Connecting cascade cables
1. Base Unit
2. Cascade Cable (connected from Base Unit Cascade Down connector
3. Cascade Cable (connected from Unit 2 Cascade Down connector to

Initial installation unit number assignment

When you install the stack, the software automatically determines the
physical order of all units in the stack according to the position of the base
unit within the stack. Thereafter, the individual units maintain their original
unit numbering, even if you change the position of one or more units in
the stack.
For example, when you initially power the stack, the base unit becomes unit
1 and the unit that the base unit connects to (across the Cascade Down
cable) becomes unit 2. The next unit is designated as unit 3, and so on, until
the maximum stack configuration (up to eight units) is reached. If another
unit in the stack is designated as the base unit, the new base unit keeps
its originally designated unit number in the stack.

Stack MAC address

When a switch participates in a stack configuration, a stack MAC address is
automatically assigned during stack initialization. The stack MAC address is
the base unit MAC address plus 1. If another unit in the stack is assigned
Copyright © 2007, Nortel Networks
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to Unit 2 Cascade Up connector)
Base Unit Cascade Up Connector)
Nortel Ethernet Routing Switch 4500 Series
Installation Guide
NN47205-300 02.01 Standard
5.0 23 February 2007
Nortel Networks Confidential